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//===- TypeMerger.h ---------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLD_COFF_TYPEMERGER_H
#define LLD_COFF_TYPEMERGER_H
#include "Config.h"
#include "DebugTypes.h"
#include "lld/Common/Timer.h"
#include "llvm/DebugInfo/CodeView/MergingTypeTableBuilder.h"
#include "llvm/DebugInfo/CodeView/TypeHashing.h"
#include "llvm/Support/Allocator.h"
#include <atomic>
namespace lld::coff {
using llvm::codeview::GloballyHashedType;
using llvm::codeview::TypeIndex;
struct GHashState;
class TypeMerger {
public:
TypeMerger(COFFLinkerContext &ctx, llvm::BumpPtrAllocator &alloc);
~TypeMerger();
/// Get the type table or the global type table if /DEBUG:GHASH is enabled.
inline llvm::codeview::TypeCollection &getTypeTable() {
assert(!ctx.config.debugGHashes);
return typeTable;
}
/// Get the ID table or the global ID table if /DEBUG:GHASH is enabled.
inline llvm::codeview::TypeCollection &getIDTable() {
assert(!ctx.config.debugGHashes);
return idTable;
}
/// Use global hashes to eliminate duplicate types and identify unique type
/// indices in each TpiSource.
void mergeTypesWithGHash();
/// Map from PDB function id type indexes to PDB function type indexes.
/// Populated after mergeTypesWithGHash.
llvm::DenseMap<TypeIndex, TypeIndex> funcIdToType;
/// Type records that will go into the PDB TPI stream.
llvm::codeview::MergingTypeTableBuilder typeTable;
/// Item records that will go into the PDB IPI stream.
llvm::codeview::MergingTypeTableBuilder idTable;
// When showSummary is enabled, these are histograms of TPI and IPI records
// keyed by type index.
SmallVector<uint32_t, 0> tpiCounts;
SmallVector<uint32_t, 0> ipiCounts;
/// Dependency type sources, such as type servers or PCH object files. These
/// must be processed before objects that rely on them. Set by
/// sortDependencies.
ArrayRef<TpiSource *> dependencySources;
/// Object file sources. These must be processed after dependencySources.
ArrayRef<TpiSource *> objectSources;
/// Sorts the dependencies and reassigns TpiSource indices.
void sortDependencies();
private:
void clearGHashes();
COFFLinkerContext &ctx;
};
} // namespace lld::coff
#endif
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